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A P I MPMS*8-4 95 m 0732290 0549080 644 
Manual of Petroleum 
Measurement Standards 
Chapter 8-Sampling 
Section 4-Standard Practice for Manual 
Sampling and Handling of Fuels 
for Volatility Measurement 
FIRST EDITION, OCTOBER 1995 
(1c[11 American Society for Testing and Materiais D5842 
American 
Petroleum 
1 Institute 
COPYRIGHT American Petroleum Institute
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COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
Manual of Petroleum 
Measurement Standards 
Chapter 8-Sampling 
Section 4-Standard Practice for Manual 
Sampling and Handling of Fuels 
for Volatility Measurement 
Measurement Coordinat ion 
FIRST EDITION, OCTOBER 1995 
American 
Petroleum 
Ins ti tu te 
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A P I M P M S * 8 - 4 95 m 0732290 0549082 417 m 
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FORE WORD 
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API MPMS*8~4 95 = O732290 054908Y 29T = 
CONTENTS 
SECTION "STANDARD PRACTICE FOR MANUAL 
O 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
. ~~ ~ 
SAMPLING AND HANDLING OF FUELS FOR 
VOLATILITY MEASUREMENT 
Page 
INTRODUCTION ................................................................................................... 1 
SCOPE ................................................................................................................... 1 
REFERENCES ...................................................................................................... 1 
DEFINITIONS ...................................................................................................... 1 
SUMMARY OF PRACTICE ................................................................................ 1 
SIG"CE AND USE ................................................................................. 2 
SAMPLE CONTAINERS ..................................................................................... 2 
SAMPLING APPARATUS ................................................................................... 2 
TIME AND PLACE OF SAMPLING ................................................................... 2 
OBTAINING SAMPLES ...................................................................................... 3 
HANDLING SAMPLES ....................................................................................... 3 
SHIPPING SAMPLES .......................................................................................... 3 
LABELING SAMPLE CONTAINERS ................................................................ 4 
SAMPLING PROCEDURES ................................................................................ 4 
13.1 General ......................................................................................................... 4 
13.2 Tank Sampling .............................................................................................. 4 
13.3 Line Sampling .............................................................................................. 6 
13.4 Automatic Samplers ..................................................................................... 6 
13.5 Grab or Spot Sampling ................................................................................. 7 
13.6 Nozzle Sampling .......................................................................................... 8 
SPECIAL PRECAUTIONS AND INSTRUCTIONS ........................................... 8 
14.1 Precautions ................................................................................................... 8 
14.2 Sample Containers ........................................................................................ 8 
Figures 
l-Slotted Stand Pipe .............................................................................................. 
2-Nozzle Extension for Nozzle Sampling With 4 Huid Ounce Bottle ................. 
3-Assembly for Bottle Sampling .......................................................................... 
4-Tank Sampling Depths ....................................................................................... 
5-Assemblies for Tap Sampling ............................................................................ 
6-Cooling Bath for Reid Equivalent Vapor Pressure Sampling ............................ 
7-Probes for Line Sampling .................................................................................. 
8-Spacer for Nozzle Sampling .............................................................................. 
9-Extension for Nozzle Sampling ......................................................................... 
10-Assembly for Nozzle Sampling ....................................................................... 
l-Summary of Gasoline SamplingProcedures and Applicability ........................ 
Tables 
2 
3 
4 
5 
6 
7 
7 
8 
9 
9 
2 
V 
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A P I MPMS*8=4 95 0732290 0549085 126 
Chapter 8-Sam p I i ng 
SECTION &STANDARD PRACTICE FOR MANUAL SAMPLING AND HANDLING 
OF FUELS FOR VOLATILITY MEASUREMENT 
O Introduction D4953 Standard Test Method for Vapor Pressure of 
Gasoline and Gasoline-Oxygenate Blends 
(Dry Method) 
Standard Test Method for Vapor Pressure of 
Petroleum Products (Automatic Method) 
Standard Test Method for Vapor Pressure of 
This standard covers procedures and equipment for ob- 
taining, mixing, and handling of representative samples of 
volatile fuels for the purpose of testing for compliance with 
the standards set forth for volatility-related measurements 
applicable. Petroleum Products (Mini Method) 
D5 190 
D5191 
1 Scope 
1.1 The applicable dry vapor pressure equivalent range of 
this standard is 13-105 kilopascals (2-16 pounds per square 
inch absolute). 
1.2 This standard is applicable to the sampling, mixing, 
and handling of light fuels and reformulated fuels including 
those containing oxygenates. 
1.3 This standard may involve hazardous materials, oper- 
ations, and equipment. This standard does not purport to ad- 
dress all of the safety problems associated with its use. It is 
the responsibility of the user of this standard to establish ap- 
propriate safety and health practices and determine the ap- 
plicability of regulatory limitations. 
1.4 The values stated in acceptable metric units are to be 
regarded as the standard except in some cases where draw- 
ings may show customary measurements that are commonly 
used for that equipment. 
2 References 
Unless otherwise specified, the most recent editions or 
revisions of the following standards, codes, and specifica- 
tions shall, to the extent specified herein, form a part of this 
standard. 
API 
Manual of Petroleum Management Standards 
Chapter 1, “Vocabulary” 
Chapter 8.1, “Standard Practice for Manual 
Sampling of Petroleum and Petroleum 
Products” 
Chapter 8.2, “Standard Practice for Auto- 
matic Sampling of Liquid Petroleum and 
Petroleum Products” 
Chapter 8.3, “Standard Practice for Mixing 
and Handling of Liquid Samples of 
Petroleum and Petroleum Products” 
ASTM’ 
D323 Standard Test Method for Vapor Pressure of 
Gasoline Products (Reid Method) 
3 Definitions 
For purposes of this standard, the following definitions 
3.1 bottom sample: A spot sample collected from the 
material at the bottom of the tank, container, or line at its 
lowest point. In practice, the bottom sample has a variety of 
meanings. As a result, it is recommended that the exact sam- 
pling location (for example, 15 centimeters [6 inches] from 
the bottom) should be specified when using this term. 
3.2 dead legs: Sections of pipe that, by design, do not 
allow for the flow of material through them. 
3.3 relief lines: Sections of pipe which lead to a pres- 
surehacuum relief valve. 
3.4 stand pipes: Vertical sections of pipe or tubing ex- 
tending from the gauging platform to near the bottom of 
tanks that are equipped with external or internal floating 
roofs. Stand pipes may also be found on ships and barges. 
Note: Do not sample dead legs or relief lines. Stand pipes which are not 
slotted or perforated for their entire length will not give representative sam- 
ples. Figure 1 is an example of an adequately slotted stand pipe. As a min- 
imum, the stand pipe should have two rows of slots slightly staggered in 
the veaical plane. 
Note: See API MPMS Chapter 1, “Vocabulary” for other definitions. 
apply: 
4 Summary of Practice 
It is necessary that the samples be representative of the 
fuel in question. The basic principle of each sampling pro- 
cedure is to obtain a sample in such manner and from such 
locations in the tank or other container that the sample will 
be representative of the fuel. A summary of the sampling 
procedures and their application is presented in Table 1. 
Each procedure is suitable for sampling a material under 
definite storage, transportation, or container conditions. The 
precautions required to ensure the representative character 
of the samples are numerous and depend upon (a) the tank, 
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Conshohocker, Pennsylvania 19428. 
1 
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\ 
2 CHAPTER &SAMPLING 
o i I ' \ 
I : ; 
Figure 1-Slotted Stand Pipe 
carrier, container, or line from which the sample is being ob- 
tained, (b) the type and cleanliness of the sample container, 
and (c) the sampling procedure that is to be used. 
5 Significance and Use 
The dry vapor pressure equivalent (DVPE) of volatile mo- 
tor fuels is regulated by federal and state air pollution con- 
trol agencies. To meet the letter of these regulations, it is 
necessary to sample, handle, and test these products in a very 
precise manner. 
6 Sample Containers 
6.1 Sample containers are clear or brown glass bottles, flu- 
orinated high-density polyethylene bottles, or metal cans. 
The clear glass bottle is advantageous because it is easily ex- 
amined visually for cleanliness and also makes visual in- 
spection of the sample for free water or solid impurities 
possible. The brown glass bottle affords some protection 
from light. The only cans acceptable are those with the 
seams soldered on the exterior surface or cans formed with- 
out soldering. 
6.2 Cork stoppers or screw caps of plastic or metal are 
used for glass bottles; screw caps with inserted seals only are 
used for cans to provide a vapor-tight closure seal. Corks 
must be of good quality, clean, and free from holes and loose 
bits of cork. Never use rubber stoppers. Contact of the sam- 
ple with the cork can be prevented by wrapping tin or alu- 
minum foil around the cork before forcing it into the bottle. 
Screw caps must be protected by a cork disk faced with tin or 
aluminum foil, an inverted cone polyseal, or other material 
that will not affect petroleum or petroleum products. The 
fluorinated bottles are supplied with polypropylene screw 
caps. 
Table 1-Summary of Gasoline Sampling Procedures 
and Applicability 
Type of Container Procedure Paragraph 
Storage tanks, ship and barge 
tanks, tank cars, tank trucks 
All-levels sampling 
Running sample 
Upper, middle, and 
lower samples 
Top sample 
Grab sampling 
Tap sampling 
Automatic sampling 
Time proportional 
How proportional 
Storage tanks with taps 
Pipes and lines Line sampling 
Grab sampling 
Nozzle sampling Retail outlet and wholesale 
purchaser-consumer facility 
storage tanks 
13.2.1.2 
13.2.1.2 
13.2.1.2 
13.2.1.2 
13.5 
13.2.2 
13.3 
13.4 
13.4.1 
13.4.2 
13.5 
13.6 
6.3 Sample size is dictated by the test method to be used. 
One liter (1 quart) bottles or cans are generally used for man- 
ual vapor pressure testing. Refer to ASTM D323, D4953, 
and D5190. The mini-vapor pressure method (ASTM 
D5191) needs a much smaller sample, and it can be taken in 
a 125 milliliter (4 fluid ounce) bottle. See Figure 2. 
6.4 All sample containers must be absolutely clean and 
free of foreign matter. Before reusing a container, wash it 
with strong soap solution, rinse it thoroughly with tap water, 
and finally rinse with distilled water. Dry completely and 
stopper or cap the container immediately. 
7 Sampling Apparatus 
Sampling apparatus is described in detail under each of 
the specific sampling procedures. Clean, dry, and free all 
sampling apparatus from any substance that might contami- 
nate the material. If necessary, use the cleaning procedure 
described in 6.4. 
8 Time and Place of Sampling 
8.1 When loading or dischargingfuels, take samples from 
both shipping and receiving tanks, and from the pipeline if 
required. 
8.2 In ship or barge tanks, sample each product after the 
vessel is loaded or just before unloading. 
8.3 In tank cars, sample the product after the car is loaded 
or just before unloading. 
Note: Time, place, and other details of sampling not covered in this stan- 
dard are normally determined by contractual agreement or reguiatory re- 
quirements. 
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SECTION &MANUAL SAMPLING AND HANDLING OF FUELS FOR VOLATILITY MEASUREMENT 3 
9 Obtaining Samples 
9.1 Directions for sampling cannot be made explicit 
enough to cover all cases. Extreme care and good judgment 
are necessary to ensure that the samples represent the gen- 
eral character and average condition of the material. Use lint- 
free wiping cloths to avoid contaminating samples. 
9.2 Many petroleum vapors are toxic and flammable. 
Avoid breathing them or igniting them from an open flame 
or a spark. Follow all safety precautions specific to the ma- 
terial being sampled. 
9.3 Do not sample dead legs, relief lines, or stand pipes 
that are not slotted or perforated (see note in 3.4). At a min- 
imum, the stand pipe should have two rows of slots slightly 
staggered in the vertical plane. 
9.4 Rinse or flush sample containers with product being 
sampled and allow to drain before drawing the sample. If the 
sample is to be transferred to another container (for testing 
other than DVPE), also rinse the sampling apparatus with 
some of the product and drain. When the sample is emptied 
into this container, upend the sampling apparatus into the 
opening of the sample container. 
10 Handling Samples 
10.1 Protect all samples of light fuels from evaporation. 
The sampling apparatus is the sample container for vapor 
pressure. Keep the container tightly closed after the sample 
is collected. Leaking sample containers are not suitable for 
testing. Cool volatile samples to G1"C (32-34°F) after de- 
livery to the laboratory and before opening the container. 
Maintain at this temperature throughout transfer and han- 
dling if at all possible. 
10.2 Never completely fill a sample container. Fill the con- 
tainer to 70-85 percent capacity to allow adequate room for 
expansion. Subsequent testing for vapor pressure requires 
this level of container fill. 
10.3 The first sample aliquot removed is for vapor pres- 
sure testing. The remaining sample in the container is not 
suitable for a vapor pressure determination but is suitable for 
other testing. 
11 Shipping Samples 
To prevent loss of liquid and vapors during shipment, place 
internal seals in the metal containers, screw the caps down 
r Tapped and threaded to fit 4 oz. bottle neck Height of 4 oz. bottle 1 
L w o slots 
11" minimum 
with 3/16'1 
radius at 
Notes: 
1. All dimensions are in inches. 
2. All decimal dimensions represent minimum and maximum. 
3. The tolerance for all other dimensions is +: inch. 
4. Made of non-ferrous material, unaffected by gasoline. 
5. Scale 0.700 inch = inch. 
Figure 2-Nozzle Extension for Nozzle Sampling With 4 Fluid Ounce Bottle 
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4 CHAPTER €!SAMPLING 
tightly, and check for leakage. Observe all shipping regula- 
tions applying to the transportation of flammable liquids. 
12 Labeling Sample Containers 
Label the container immediately after a sample is ob- 
tained. Use waterproof and oilproof ink or a pencil hard 
enough to dent the tag, since soft pencil and ordinary ink 
markings are subject to obliteration from moisture, product, 
smearing, and handling. Typical label information includes 
the following information: 
a. Date and time (the period elapsed during continuous sam- 
pling). 
b. Name of the sample (location). 
c. Name or number and owner of the vessel, car, or con- 
tainer. 
d. Brand and grade of material. 
e. Reference symbol or identification number. 
f. All applicable federal, state, and local labeling regulations 
should be conformed to. 
13 Sampling Procedures 
13.1 GENERAL 
The standard sampling procedures described in this 
method are summanzed in Table 1. Alternative sampling pro- 
cedures can be used if a mutually satisfactory agreement has 
been reached by the party or parties involved and such agree- 
ment has been put in writing and signed by authorized offi- 
cials. 
13.2 TANK SAMPLING 
13.2.1 Bottle Sampling 
The bottle sampling procedure is applicable for sampling 
fuels of 105 kilopascals (16 pounds per square inch absolute) 
Reid equivalent vapor pressure or less in tank cars, tank 
trucks, shore tanks, ship tanks, and barge tanks. 
13.2.1.1 Apparatus 
A suitable sampling bottle, as shown in Figure 3, is re- 
quired. Recommended diameter of the opening in the bottle 
or sample thief is 19 millimeters (3/4 inch). 
b 
A 
Cork 
detail 
i-Litre ( i qt.) 
Sample Weighted Cage 
(can be fabricated 
to fit any size bottle) 
B 
Clove 
hitch 
Eyelet 
Washer 
Cork arrangements 
Figure +Assembly for Bottle Sampling 
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A P I M P M S * 8 * 4 95 m 0732290 0549089 871 m 
SECTION &MANUAL SAMPLING AND HANDLING OF FUELS FOR VOLATILITY MEASUREMENT 5 
13.2.1.2 Procedure 
13.2.1.2.1 All-levels Sample 
Lower the weighted, stoppered bottle (Figure 3) as near 
as possible to the draw-off level or, if higher, to a point just 
above the free water or other heavy material, pull out the 
stopper with a sharp jerk of the cord or chain, and raise the 
bottle at a rate so that it is 70-85 percent full as it emerges 
from the liquid. 
13.2.1.2.2 Running Sample 
Lower the stoppered container (with a hole or slot in the 
stopper) at a uniform rate as near as possible to the levei of 
the bottom of the outlet connection or swing line or, if 
higher, to a point just above the free water or other heavy 
material and immediately raise the bottle to the top of the 
fuel at a rate of speed such that it is 70-85 percent full when 
withdrawn from the liquid. 
Note: Running or ail-level samples are not necessarily representative be- 
cause the tank volume may not be proportional to the depth and because the 
operator may not be able to raise the sampler at the required rate. 
13.2.1.2.3 Upper, Middle, and Lower Samples 
Lower the weighted, stoppered bottle to the proper depths 
(Figure 4) as follows: 
a. Upper sample: middle of the upper third of the 
tank contents. 
b. Middle sample: middle of the tank contents. 
c. Lower sample: middle of the lower third of the 
tank contents. 
At the selected level pull out the stopper with a sharp jerk 
of the cord or chain and allow the bottle to fill completely, 
Hatcht 
Outlet 
/u \ 
f'" cm (6") 
"t * Upper sample Top sample Upper third 
*Middle sample Middle third 
- - 
* Lower sample Lower third 
A Outlet sample 
L- Boitom sample 
Note: The outlet sample location shown applies only to tanks with side out- 
lets. It does not apply when the outlet comes from the floor of the tank or 
tums down into a sump. 
Figure &Tank Sampling Depths 
as evidenced by the cessation of air bubbles. When full, raise 
the bottle, pour off a small amount (about 20 percent), and 
stopper immediately. 
13.2.1.2.4 Top Sample 
Obtain this sample (Figure 4) in the same manner as spec- 
ified for an upper sample but at 150 millimeters (6 inches) 
below the top surface of the tank contents. 
13.2.1.2.5 Handling 
Cap and label bottle samples immediately after taking 
them, and deliver to the laboratory in the onginal samplingbottles. Multiple samples must be tested individually for va- 
por pressure. A composite sample is acceptable for other an- 
alytical tests. Inverting the sample container can aid in leak 
detection. The sample container may be placed in ice imme- 
diately for cooling, if practical. 
13.2.2 Tap Sampling 
The tap sampling procedure is applicable for sampling 
liquids of 105 kilopascals (16 pounds per square inch abso- 
lute) DVPE or less in tanks that are equipped with suitable 
sampling taps or lines. This procedure is recommended for 
volatile stocks in tanks of the breather and balloon roof type, 
spheroids, floating roof tanks, and so forth. The assembly for 
tap sampling is shown in Figure 5. 
13.2.2.1 Apparatus 
13.2.2.1.1 TankTaps 
Equip the tank with at least three sampling taps placed 
equidistant throughout the tank height. A standard 6.4 mil- 
limeters (1/4 inch) pipe with suitable valve is satisfactory. A 
sufficient number of sample taps are needed on the tank to 
make sampling possible at various levels. 
13.2.2.1.2 Tube 
Use a delivery tube that will not contaminate the product 
being sampled and one long enough to reach to the bottom of 
the sample container to allow submerged filling. 
13.2.2.1 -3 Tube Chiller Assembly (Optional) 
If a sampling chiller is used, it is a coil of tubing im- 
mersed in an ice bath to chill a fuel sample as it is dispensed 
into the sample container. 
13.2.2.1.4 Sample Containers 
strength or metal containers to receive the samples. 
13.2.2.2 Procedure 
Before a sample is drawn, flush the sample tap and tube 
until approximately three times its volume has been purged. 
Use clean, dry glass bottles of convenient size and 
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A P I MPflS*B-Li 95 = 0732290 05i.19090 593 
6 CHAPTER -AMPLING 
Figure &Assemblies for Tap Sampling 
When sampling for Reid equivalent vapor pressure, the con- 
tainer must be chilled to a temperature as low as the mate- 
rial in the tank or to O°C (32OF), whichever is greater (see 
sample chilling apparatus in Figure 6). Filling the container 
and emptying it three times will meet this temperature re- 
quirement. Draw upper, middle, or lower samples directly 
from the respective taps after the flushing operation. Stop- 
per or seal, cap, and label the sample container immediately 
after filling, and deliver it to the laboratory. 
13.3 LINE SAMPLING 
13.3.1 General 
The continuous sampling procedure is applicable for sam- 
pling liquids of 105 kilopascals (16 pounds per square inch 
absolute) Reid equivalent vapor pressure or less and semi- 
liquids in pipelines, filling lines, and transfer lines. The line 
sampling may be done manually or by using automatic de- 
vices. To take a representative sample from a line, the con- 
tents are mixed to ensure uniform distribution of all 
components and contaminants across the line. If it is neces- 
sary to condition the stream, this is done four to six pipe di- 
ameters upstream of the sample point. 
13.3.2 Apparatus 
13.3.2.1 Sampling Probe 
The function of the sampling probe is to allow withdrawal 
of a representative portion of liquids. The apparatus assem- 
bly for dynamic line sampling is shown in Figure 7. A probe 
is recommended for sampling of static systems but not re- 
quired. Probe designs that are commonly used are as follows: 
a. A closed-end tube with a round orifice spaced near the 
closed end (Figure 7A). 
b. A long-radius forged elbow or pipe bend with the end of 
the probe reamed to give a sharp entrance edge (Figure 7B). 
c. A tube beveled at a 45-degree angle (Figure 7C). 
13.3.2.2 Probe Location 
The probe inlet is extended into the pipe to the center one 
half of the pipeline diameter. The probe is inserted perpen- 
dicular to the direction of flow with the sample opening fac- 
ing upstream. The sampling lines are kept as short as 
practicable and purged completely before any samples are 
taken. 
13.3.2.3 Valves 
To control the rate at which the sample is withdrawn, the 
probe or probes are fitted with ball, gate, needle, or large port 
valves. 
13.4 AUTOMATIC SAMPLERS 
An automatic sampler includes not only the automatic 
sampling device that extracts the samples from the line, but 
also a suitable probe, connecting lines, auxiliary equipment, 
and a container in which the sample is collected. It must 
maintain sample integrity. Refer to API MPMS Chapter 8.2. 
Automatic samplers are classified as follows: 
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SECTION &MANUAL SAMPLING AND HANDLING OF FUELS FOR VOLATILITY MEASUREMENT 
Outlet 
valve 
A / 
Thermometer- i ,- 
a To tank 
urging valve 
Top view 
Figure &Cooling Bath for Reid Equivalent Vapor Pressure Sampling 
13.4.1 Continuous Sampler,Time Cycle 
(Non-Proportional) Type 
This sampler is designed to transfer equal increments of 
liquid from the pipeline to the sample container at uniform 
time increments. 
13.4.2 Continuous Sampler, Flow-Responsive 
(Proportional) Type 
This sampler is designed to automatically adjust the sam- 
pling rate to be proportional to the flow rate of the stream. 
13.4.3 Calibration 
Prior to initial operation, the sample bite size must be ver- 
ified to be within +_ 5 percent of the specification using an 
acceptable calibration procedure. Additionally, the required 
sample volume must be obtained during any sampling pe- 
riod so that the manufacturer's sampling interval is not ex- 
ceeded. 
13.4.4 Container 
The container must be clean, dry, and of a convenient size 
to receive the sample. All connections from the sample probe 
to the sample container must be free of leaks. The container 
is constructed to prevent evaporation loss. The construction 
must allow cleaning, interior inspection, and complete mix- 
ing of the sample prior to removal. A fixed-volume type con- 
tainer is equipped with a pressure-relief device. 
13.5 GRAB OR SPOT SAMPLING 
Purge approximately three volumes of product through 
the sample tap and tubing. Divert the sample stream to the 
sampling container to provide a quantity of sample that will 
be of sufficient size for analysis. 
End of probe 
closed orifice 
facina mstrearn 
6.4 rnrn - 5 cn - 
Manufacturers 6.4 mm - 5 cm (V4" -2") pipe 
45" bevel 
A 
Figure 7-Probes for Line Sampling 
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A P I MPMSr8-4 95 = 0732290 0549092 366 D 
8 CHAPTER &SAMPLING 
Use this slot for 
unleaded gasoline gasoline or fuels 
Use this slot for leaded 
Make froml/,' flat non-ferrous metal 
All dimensions in inches 
Break all edaes and corners 
Figure -pacer for Nozzle Sampling 
13.6 NOZZLE SAMPLING 
light fuels from a retail type dispenser. 
The nozzle sampling procedure is applicable for sampling 
13.6.1 Apparatus 
Sample containers conforming with Section 6 should be 
used. A spacer, if appropriate, and a nozzle extension as 
shown in Figures 8 and 9 are used when nozzle sampling. 
13.6.2 Procedure 
Immediately after fuel has been delivered from the pump 
and the pump has been reset, attach a spacer (Figure 8), if 
needed, to the pump nozzle (vapor recovery type). Insert 
nozzle extension (Figure 9) into the previously chilled sam- 
ple container and insert pump nozzle into extension with slot 
over air bleed hole. Fill the sample container slowly through 
nozzle extension to 70-85 percent full (Figure 10). Remove 
nozzle extension. Insert the seal and cap or stopper into the 
sample container at once. Check for leaks. If a leak occurs, 
discard the sample container and resample. If the sample 
container is leak tight, label the container and deliver it to 
the laboratory.14 Special Precautions and Instructions 
14.1 PRECAUTIONS 
Vapor pressures are extremely sensitive to evaporation 
losses and to slight changes in composition. When obtain- 
ing, storing, or handling samples, observe the necessary pre- 
cautions to ensure samples representative of the product and 
satisfactory for Reid equivalent vapor pressure tests. Never 
manually prepare composite samples for this test. Make cer- 
tain that containers that are to be shipped by common carrier 
conform to applicable federal, state, and local regulations. 
When flushing or purging lines or containers, observe the 
pertinent regulations and precautions against fire, explosion, 
and other hazards. Collect all line flushes and bottle rinses 
for proper recovery or disposal. 
14.2 SAMPLE CONTAINERS 
Use containers of sufficient strength to withstand the 
pressures to which they can be subjected and of a type that 
will permit replacement of the cap or stopper with suitable 
connections for transferring the sample to the gasoline cham- 
ber of the vapor pressure apparatus. 
COPYRIGHT American Petroleum Institute
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COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
SECTION &MANUAL SAMPLING ANO HANDLING OF FUELS FOR VOLATILITY MEASUREMENT 9 
Use this end 
-for unleaded 
gasoline 
Use this end 
forleaded - 
gasoline and 
fuels 
I - - 1 
Notes: 
1. Use 3/4 inch Schedule 80 non-ferrous pipe. 
2. Ail dimensions in inches. 
3. Ail tolerances -C V12@ 
4. Recommend 30". 
5. Inside diameter Schedule 80 non-ferrous pipe. 
Figure 9-Extension for Nozzle Sampling 
Nozzle Nozzle extension 
Nozzle Without Vapor Recovery Nozzle With Vapor Recovery 
Figure 1 &Assembly for Nozzle Sampling 
COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
A P I MPMS*8-4 95 = 0732270 0549094 I137 
1-01 102-10/9S7.5C (1 E) 
COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
~ 
A P I MPMS*8 .4 95 m 0732290 0549095 075 m 
American Petroleum Institute 
1220 L Street, Northwest 
Order No. HO8041 
COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services
COPYRIGHT American Petroleum Institute
Licensed by Information Handling Services